Shuttle-checking mechanism for weaving looms



Sept. ,7 1926. 1,599,297

- F. souczEK v SHUTTLE CHECKING MECHANISM FOR WBLVING LOdMS Filed July 14, 1925 BYYQMVOQ.

A TTORNEYS.

Patented Sept. 7, 1926 FERDINAND souoznx, or NEAR CESKA Lira, Boner/ria Ass'IeNoR TO vnnnnnrenn TnxTrEL-M ATscHarrIJnN MAUTNEB, or ROTTERDAIVI, NETHERLANDS.

SHUTTLE-CHECKING MEcH-ANisM r'oa wnavine Loo vrs.

Application filed J'uly-l4, 1925, Serial No.4a571, and in Germany JulyS, 1924.

In ordinary weaving looms, the stopping of the shuttle entering the shuttle box at a great speed is effected almost exclusively by braking it by means of a spring controlled tongue or ledge projecting into the shuttle box. This braking takes place with a perfectly uniform retardation, as the. spring pressure remains constant as soon as the shuttle has displaced the shuttle box tongue.

The working diagram in this case is practically a rectangle represented in Figure 4 of the accompanying drawing by the surface 0. A. E. If however the shuttle is received by springs .for the purpose of recovering the momentum which it still possesses on coming into the shuttle box, namely. in such a manner that the springs act on the shuttle directly or in a constant ratio indirectly, the springs are brought uniformly from their tensionless state to the state of their maxi mum tension at the end; in this casethe working diagram will be a triangle corresponding to the surface 0. B. E. in Figure 4. It is clear that with equal area of'the working'diagram, that is to say with equal.

brake work, the mechanical stresses on the brake device in this case will be much greater, owing to the great end-tension, than in the first case. Finally, if the springs are so arranged that they act on levers and replace the elasticity of the arc of a cross-bow, the braking force will be still greater for the same work, as shown by the line OC in Figure 1.

By the present invention, the counterforce acting by means of springs on the shuttle can be given any'desired course;'moreover this invention ensures also a very great reduction of the mass accelerations, owing to which not only the braking and picking or shooting is eifected in a manner perfectly corresponding to the law of motion, but also a very high efficiency in respect of recovery of the momentum of the shuttle is obtained.

A constructional form of this invention is shown in the accompanying drawing in which Figure 1 is a front elevation of the arrangement of the right hand shuttle box be fore the arrival of the shuttle and Figure 2 after its arrival- Figure v3 is intended to show the forces, and Figure 4 the working during the braking or picking of the shuttle.

To the rear wall of the shuttle box guide 1 is secured a carrier arm 2 which supports the These springs are always under tension i and therefore hold the two curved discs in theposit on shown in Figure l, the strap or belt 5 being held taut. This strap is of such a length that the rectilinear ends 8 ofthe curved discs 4 forms a straight line with'the strap 5. Further the strap is loosely passed through the leather eye 9 of the cork picker- 10.' The picker 10 has the same cross-section as the shuttle guide or'race, so that the shuttle race at the same time. forms the pickerguide. At the front and rear ends of the central part of the corktpicker are secured protecting means such as leather end pieces.

W hen on arriving the shuttle strikes the picker or driver, it brings the picker into the position shown inFigure 2, the belt pulled wlth it being lifted off the convex surfaces of the two curved discs which latter are at the same time turned through a certain angle, owingto which the tension of the springs Y is still further increased. The brakeblock 11 described in U. S. Patent No. 1,568,036, 2

is in this case operated so that its swinging support 12 s brought by the spring '13.. en-

' gaging with it, into-the brake batten at the moment when the segment 14 secured to the: lower disc 4 leaves the roller 15 ofv the swing ing support 12. v

F igure 3 shows the action of the forces,

the section Z or Z, indicating the leverage relatively to the belt or strap tension Q, at the time. This force moment is balanced by that of the spring force 39 with'its leverage r, so that p rzQ L The force P which acts on the shuttleor on the driver, follows from the belt tension Q, at the time, and is at any time equal to 2Q cos B, or

(since Q fi Here the angle ,8 is the angle which the belt or strap makes with the shuttle race. The object of the curved stretchers is therefore to bring the force P which in Figure l is zero (as the angle [3 is degrees)- quickly to a maximum Which, during further penetration of the shuttle or rotation of the stretchers, remains; Without modification, Which is etlectedby the leverage Z being modified by the curvature, of the stretchers, in accordance with the progressing change of the angle ,8. r i

It is obvious that the change in itself inconsiderable of the spring force p and of the leverage 1, must be taken into account in calculating the shape of the curve.

The line O-D in Figure 4 shows the course of the counterforce B which is obtained With the stretchers shown in Figures 1 and 2.

Another essential advantage of this arrangement is thatthe springs 6 are exposed in Working only to slight changes of tension owing to Which their life is lengthened. The rectilinear end portion 8 of the stretchers 4 has for its object to keep them in symmetrical initial' position, so that the strap starts a uniform distribution of the forces at the arrival of the shuttle.

It is to be understood that the invention is not limited to the foregoing embodiment which is given only by way of example, as the details of construction may be modified or changed Without departing from the spirit or scope of the invention defined by the followii'ig claims.

What I claim and desire to secure by Letters Patent 01 the United States is 1. In shuttle mechanism for Weaving looms, a picker arranged in the path of the shuttle,two pivotally mounted spring controlled curved stretchers on either side of the path of the shuttle, and a flexible belt stretched across the path of the shuttle and fixed on either end to one of the stretchers,

the latter having a flat portion next to the path of the shuttle and a curved portion adjoining the fiat portion, the curved portion being so shaped that on the stretchers being turned by the belt under the impact of the shuttle, the leverage relatively to-the belt tenizon quickly increases to a predetermined maximum and during the further progress of the shuttle remalns stationary. j

2. In Weaving looms, shuttle mechanism comprising a shuttle, a racev for said shuttle,

a picker on said race, tWo curved stretchers pivotally mounted on either side ofthe race, a flexible belt stretched across thepath of the shuttle and fixed on either end to one of the stretchers, and springs connected to said stretchers for holding the belt normally taut, said stretchers having a flat portion next to the path of the shuttle and a curved portion adjoining the flat portion, the curved portion being so shaped that on the stretchers being turned by the belt under the impact of the shuttle, the leverage relatively to the belt tension quickly increases to a predetermined maximum and during the further progress of the'shuttle remains stationary.

3. In Weaving looms, shuttle mechanism comprising a shuttle, a race for said shuttle, a movable cork picker having a crosssection corresponding With the cross-section of said shuttle race, leather end pieces for said picker, belt support for said picker and two rotatable spring-controlled curved stretche'rs to Which the ends of the belt support are attached, the arrangement being such that the shuttle upon striking the picker causes the belt support to rotate said stretch ers against the action of their springs;

4:. In Weaving looms, shuttle mechanism comprising a shuttle, a race for said shuttie, a movable cork picker having across section corresponding with the cross-section of said shuttle race, leather end pieces for said picker, a belt support for said picker and two rotatable spring-controlled curved stretchers to which the ends of the belt-support are attached, said curved stretchers hav ing a fiat portion adapted to contact With said belt support When said picker is in its normal position of rest.

In testimony whereof he affixes his signa ture.

I Fnnnrnann soucznia 

